lavatory
n. B1 Intermediate US //ˈɫævəˌtɔɹi// UK //lˈævətəɹˌi// lava·to·ry
n. a room or building where you can go to the bathroom. It is a more formal or slightly funny word for a toilet.
n. a room or building containing a toilet and washbasin. Often used in British English as a formal or euphemistic alternative to 'toilet'.
The lavatory is located at the back of the building.
The hotel staff directed the guests to the lavatory on the second floor.
From Middle English lavatorie, from Late Latin lavātōrium, from Latin lavāre (“to wash”) + -ium (forming places related to an activity). As a place to pan gold, via Spanish lavadero. Doublet of lavatorium and laver. See also lave.
From Latin lavātōrius.